I would try removing the power from the printer, giving it a few minutes and then trying again. If the problem is still there I think you will have to call tech support.
Thanks. After a couple attempts...turning printer on and getting error message...I got a new error message "68:03 When possible restart the printer"
Once again, couldn't restart from front of printer, had to turn switch off and on.
After turning on, I got 44% through the HP startup bar on the front window and it froze.
Turned off Power switch (on back of printer), and turned on. Got 100% through the HP startup bar, through inititalization and through Preparing Print System.
All seems OK now...strange. But, I've built enough systems to have seen stranger!
Now, from the info. window, I show Firmware Version: TR12-TR_18.104.22.168
Not sure what caused my problems. I was connected via Ethernet on a new mobo with dual ethernet ports (Asus P5W DH Deluxe) on a new system build. I uninstalled the printer and the HP software...I think I will reinstall and maybe use USB instead.